For optimal heart health, you should not consume more than 1,500 milligrams of sodium each day. You need some sodium in your diet to help maintain normal fluid balance, but too much sodium increases blood pressure and stroke risk. Eating junk food high in sodium, such as potato chips, french fries and pepperoni pizza, may increase your risk of stroke. A study by researchers at the University of Miami published in a 2012 edition of "Stroke; A Journal of Cerebral Circulation" found that the risk of stroke increases by 17 percent for every 500 milligrams of sodium consumed over the recommendation. For example, consuming 2,500 milligrams of sodium increases your risk of stroke by 34 percent. If you have a weakness for potato chips, opt for low-sodium or salt-free varieties, to lessen your sodium intake.